1. There are currently no email settings configurable from the Vantage admin dashboard, but there is an expiry email sent relating to listings (not including upgrade options). Any modifications to the existing emails would require customization of the default theme files at this time.
2. You can create a custom form related to category but the listing display is essentially the same (apart from the additional fields you have added).
3. AppThemes does not offer customization services, however we do have a
certified partners page where you can find developers for hire. If you make contact directly with an outline of your requirements, they will be able to provide a quote for the work. Thanks.